Activate Woe Strider by sacrificing Reassembling Skeleton.
When Reassembling Skeleton dies, Pitiless Plunderer and Fumulus trigger, creating a creature token and a Treasure token.
Resolve the Woe Strider ability.
Activate Woe Strider by sacrificing the creature token.
When the creature token dies, Pitiless Plunderer triggers, creating a Treasure token.
Resolve the Woe Strider ability.
Activate the Treasures by tapping and sacrificing them, adding 1.
Activate Reassembling Skeleton by paying 1, returning it from your graveyard to the battlefield.
Repeat.
This infinite loop hinges on a clever self-contained recycling engine fueled by Pitiless Plunderer, which refunds your investment every time a creature meets its end. By feeding Reassembling Skeleton and its token byproduct into Woe Strider's sacrificial maw, you generate a steady stream of death triggers and Treasure tokens that easily pay to bring the Skeleton right back. Meanwhile, Fumulus, the Infestation turns your nontoken sacrifices into extra insect fodder and a slow drain on your opponents' life totals, tying the whole dark machinery together into a relentless win condition.